Red Sox call up Rubby De La Rosa

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BALTIMORE — Righthander Rubby De La Rosa, one of the top prospects in the organization, has been added to the Red Sox roster. The 24-year-old will be available out of the bullpen during Friday night’s game against Baltimore.

De La Rosa was acquired from the Dodgers last August. He was 4-5 with a 3.96 earned run average in 14 appearances (10 starts) with Los Angeles from 2011-12.

De La Rosa missed most of last season recovering from elbow surgery and the Red Sox have been methodically building up his workload at Triple A Pawtucket this season. In 11 starts, he has thrown only 38.1 innings. De La Rosa is 0-1 with a 3.29 ERA for Pawtucket. He has allowed 25 hits, walked 20 and struck out 38.

In his last eight starts, De La Rosa has a 1.41 ERA.

De La Rosa can touch 98 with his fastball and sits comfortably at 94-95. But his best pitch might be a changeup that drops through the strike zone. Pedro Martinez, De La Rosa’s mentor, worked closely with him in spring training and has visited Pawtucket for further sessions during the season.

De La Rosa’s third pitch is a slider. Some projections have him becoming a late-inning reliever. But the Red Sox will first seek to develop him as a starter. How that slider progresses could determine that.

Alex Wilson has been sent back to Pawtucket after throwing 2 2/3 innings on Thursday night and taking a hard-luck loss in a 13-inning 5-4 setback against Baltimore.

This marks four consecutive days the Red Sox have promoted a pitcher from Pawtucket.